// 暴力版
class Solution {
  public boolean findNumberIn2DArray(int[][] matrix, int target) {
      for(int i=0;i<matrix.length;i++){
          for(int j = 0;j<matrix[i].length;j++){
              if(matrix[i][j] == target){
                  return true;
              }
          }
      }
      return false;
  }
}